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Finding the Fourth Proportional to 640.16, 960.24 and 255.68

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Solution

The fourth proportional to 640.16, 960.24 and 255.68 is: 383.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.16 : 960.24 = 255.68 : x
  2. Step 2: Convert to fraction form
    640.16/960.24 = 255.68/x
  3. Step 3: Cross multiply
    640.16x = 960.24 × 255.68
  4. Step 4: Simplify right side
    640.16x = 245,514.16
  5. Step 5: Solve for x
    x = 245,514.16/640.16
  6. Step 6: Final answer
    x = 383.52

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.